Ni-Cr-Mo is a candidate to substitute Co binders in WC-based composites, where high corrosion resistance is required. This work focused on the effect of Cr on the corrosion susceptibility of WC-Ni-Cr-Mo composites, in acid media. Specimens were produced by powder metallurgy followed by microstructural, chemical and mechanical characterization. Open circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were employed to evaluate the corrosion susceptibility of WC-Ni-Cr-Mo alloys with different Cr content. The results highlight the greater aggressiveness of chloride medium compared to sulphate environment, and reveal that Cr can effectively decrease corrosion susceptibility without hampering the mechanical properties in both media, especially in chloride solution, where major improvements are observed.

Ni-Cr-Mo是在需要高耐腐蚀性的WC基复合材料中替代Co粘合剂的候选材料。这项工作的重点是在酸性介质中Cr对WC-Ni-Cr-Mo复合材料的腐蚀敏感性的影响。通过粉末冶金，随后的微观结构，化学和机械表征来制备样品。通过开路电势测量，电位动力学极化和电化学阻抗谱（EIS）来评估不同Cr含量的WC-Ni-Cr-Mo合金的腐蚀敏感性。结果表明，与硫酸盐环境相比，氯化物介质具有更强的腐蚀性，并表明铬可以有效降低腐蚀敏感性，而不会影响两种介质（尤其是氯化物溶液）的机械性能，